Ok so I've got the body sprayed in the metallic finish. Painted it with Plastikote Anthracite Metallic which gave a tremendously realistic metal finish. Hope you like, there are still some details to add and finish, especially being the rear sight and the barrel details, but they will come in time.
Gas plug handle was 3d printed.
Cleaning brush was 25mm tube and on the top part 2x 10p coins glued together and the top one dremelled smooth on top
Cooling fins extend into the barrel
Stock and handle sides are real wood varnished.
Cooling fins painted with brass spray paint
Still a few details to finish on the stock as I said